Add feature: dolthub.com (dolt)

[Copilot]

Adds a new devcontainer feature for dolt — a SQL database with Git-style versioning from DoltHub.

Changes

• src/dolthub.com/ — new feature using the standard gh release install pattern
  • Downloads dolt-linux-{amd64|arm64}.tar.gz from dolthub/dolt GitHub releases
  • Extracts binary from dolt-linux-{arch}/bin/dolt into /usr/local/bin
  • Supports amd64 and arm64 architectures
• test/dolthub.com/test.sh — verifies dolt version executes successfully
• README.md — adds table entry alphabetically between diffity.com and dozzle.dev

Usage

{
  "features": {
    "ghcr.io/devcontainer-community/features/dolthub.com:1": {}
  }
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add feature "dolthub.com"</issue_title>
<issue_description>Gh repo dolthub/dolt</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add feature "dolthub.com" #186

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